Transcript Multiplying Real Numbers

Multiplying Real Numbers
Products of Positives and
Negatives
Rules for Multiplying Non zero
Numbers
• DO THE MATH!!!!!!
• Write down the numerical quantity THEN
• Count the negative signs
– If the number of signs used was odd:
– The answer is NEGATIVE!
– If the number of signs used was even:
– The answer is POSITIVE!
2(-3)(4)(-2) Think!
23 4 2 is 48 and
there are TWO negative
signs so the answer is
POSITIVE 48
2(-3)(-4)(-2) Think!
23 4 2 is 48 and there
are THREE negative signs so
the answer is NEGATIVE 48
Now you try!
• 3(-5)
• -2(4)(5)
• -1/2(-2)(3)
• (-2)3
• -(-3)3
Products in real life
• Displacement is a measure of the distance
covered with the direction in which the
object traveled!
• Example: If I fell off a cliff at a velocity of -5
feet per second, what would my
displacement be?
Now you try!
• A helicopter has a velocity of -15 feet per
second. Find the displacement after 4.5
seconds.
• Bonus: What is the DISTANCE traveled in
10 seconds?
Products of variable terms
•
Remember when multiplying variable
terms (AKA Simplifying expressions)
1. Multiply coefficients first
2. Then multiply variables (getting the
exponents right!)
3. Add up the negative signs and write the
answer!
(-2) (x)(x)(-4x)
Your turn again!
• 8(-t)
• -x (-x)(-x)(-x)
• -7(-b)3
BE CAREFUL! The last
problem is TRICKY!!!!!
Individual Practice
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PWB Section 2.5
HW pg. 97 41-55
Where are you in chapter 2????
Vocabulary is due Sept 15!!!!
1: What chapter are we doing again?
5: I better beg my folks to bring me to tutoring!
10: I will have a high grade on Friday’s quiz!